Montalto Ligure was a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 100 kilometres (62 mi) southwest of Genoa and about 15 kilometres (9 mi) west of Imperia. As of 31 December 2004, it had a population of 364 and an area of 13.9 square kilometres (5.4 sq mi). At the beginning of 2018 Montalto Ligure was unified with Carpasio in the new comune of Montalto Carpasio.

Montalto Ligure bordered the following municipalities: Badalucco, Carpasio, Dolcedo, Molini di Triora, and Prelà.

Demographic evolution